cluster-discovery: fix broken link to yamllint.com
cluster-discovery: fix broken link to yamllint.com
endocode/coreos-docs,bq-xiao/docs,joshix/docs,mischief/coreos-docs,wli6/docs,robszumski/docs,coreos/docs,jdloft/docs,skynet/docs,michelleN/docs,ionave/docs,ksmaheshkumar/docs-2,atxwebs/docs,marineam/coreos-docs,jonboulle/docs,iankronquist/docs,hkjn/docs-1,mjg59/docs